BBM... what did you read? Can you link? I'd like to familiarize myself and learn more about tribal law enforcement and related topics. Based on the reservations website, I don't see why the LEO had no right to do what he did, but admittedly, I am not very familiar with how law enforcement is handled on reservations in PL 280 states.
http://www.badriver-nsn.gov/history
http://www.twincities.com/2017/11/1...on-was-out-sick-from-school-grandparents-say/
LE doesn't have jurisdiction in areas of amendment rights of a tribe.
I linked about that on the previous page.
Here is some case law for your perusal
(quote)
The state contends that the trial court erred when it dismissed citations issued to John and Peter Lemieux for their violation of sec. 29.224 (2), Stats.[2] Section 29.224 (2) prohibits the possession or *486 transportation of uncased or loaded firearms in vehicles. The court held that the state did not have jurisdiction to enforce sec. 29.224 against enrolled members of an Indian tribe within the boundaries of their reservation. Because the state has failed to establish its subject matter jurisdiction, we affirm.
https://law.justia.com/cases/wisconsin/court-of-appeals/1982/81-713-6.html